1. The lights were only switched on before it began to grow dark.
  2. The lights are being switched on before it began to grow dark.
  3. The lights were being switched on by the watchman before it began to grow dark.
  4. The lights were switched on by the watchman before it began to grow dark.
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1 Answers

Answer: Option 4

The lights were switched on by the watchman before it began to grow dark. Given sentence is in simple past tense and it is in active voice. Rule : Subject + (was/were) + V2 + Other agents

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